Valve-gear.



No. 665,085. Patented Jan. I, mm.

' w. GABRELS.

VALVE GEAR. (Lpplication filed July 24, 1899. Renewed Oct. 24, 1800.)

2 sheets-sheet 1.

(N0 Model.)

No. 665,085. a

No Mode l.)

' Patented Jan. l, 1901. W. L. GARRELS.

VALVE GEAR.

7 (Application filed July 24, 1899. Renewed Oct. 24, 1900.)

2 Shsts-Sheet 2.

UNITED STATES PATENT, OFFICE.

WILL IAM L'. eARRELs, "oF ST. Louis, MISSOURI- {V LVE-GEAR.

srncrrroetrlon forming part of Letters Patent No. 665,085, dated.ianuaryi, 1901. Application filed July "24, 1899. Renewed October 24,1900: Serial No. 34,179. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM'L. GARRELS, a citizen of the United States,and a resident of the city of St. Louis, in the State of Missouri, haveinvented certain new and useful Improvements in Valve-Gears, of whichthe following is a specification.

My in vention relates-to valve-gears, and has forits principal object toobtain constant lead and tocause preadmission, cut-off, release, andcompression to occur at substantially corresponding points of thestroke.

' To these ends my invention consists in the arrangements andcombinations of parts hereinafter described and claimed.

In the accompanying drawings, which form part of this specification, andwherein like symbols refer .to like parts wherever they occur, Figure Iis a side elevation of my valvegear, showing the parts on the near sidein full lines, while the parts on the opposite side are-shown in dottedlines; Fig. II is a plan viewof my gear. Figs. III and IV represent amodification, being, respectively, a

sideelevation and a plan view of the connections of one valve only. Fig.V is a similar view to Fig. II with the parts somewhat differentlyarranged, and Fig. VI is a detail view of a modification of the deviceswhich conthe parts.

tribute the variable component of the valve motion.

' My gear is arranged for use in connection with two separate engines oran engine having a 1 plurality of cylinders. The'va'lve for eachcylinder or engine is connected to the I reciprocating parts of bothengines in such a way that the motion of each valve is substan-'although there are certain obvious difi'erenc'esin detail arising fromdifferent locations-of For convenienceof reference the parts on one sideof the engine are designated ,in the drawings bycapital letters, whereasthe'corresponding parts on the other side are designated bythe'corresponding small letters. The valve A isconnecteid by a rod B toa lever C, and this; lever is connected by a rod the lap and lead of thevalve.

D to a lever E, and this lever E is connected in turn by a rod F to "thecross-head G'of the same engine to whiclr'the valve A'belongs.

.The movement of the cross-head thus communicates a definitereciprocating motion to.

the valve of its engine, which motion is predetermined by thearrangementof the intermediate con necting devices, so as to overcometeristic of the motion of the cross-head is that it is rapid in themiddle'of its stroke and slow at the end of its stroke. By theconstruction just described this characteristic motion is transmitted tothe valve, so that the opening and closing thereof are effected with aquick movement. Instead of havinga fixed fulcrum, however, the lever Ohas a movable fulcrum-'that is, it is a floatin'g" lever. This movablefulcrum isa pivot H, by which it is connected to a rod IL This rod-Icarries The characa pivot-pin orablock K,. pivotally fastened thereto,and this pin'or block fits and slides" on a curved link L, the curve ofwhich ,is a circular arc of a radius equal to the distance.

between the pivot-point H and the pivot pin -or block .K. The parts areso arranged that curvature of'said link. The middle pointofthe travel ofthe pivotor fulcrum H is thus fixed forall positionsof the radius-rod Iso long as the link L remains in its middle posi tionthat is, in thisposition of said "link the' pivot pin or block K may be shifted to anydesired position on the link without changing said point. V I

The link L is fixed on a transverse rock shaft m, which is connected toand rocked or oscillated by the opposite engine; A convenient means forrocking such shaft is to have the lever e fixed thereto, as shown in thedrawings. with the'rock-shaft m, the block merely rocks on its pivot,which i'emainsstationary; but

When the block K is concentric when the block K is shifted along'thelink'to a position eccentric to the rock-shaft m said blockreceives amotion of translation, which" is communicated through the radius-rod Ito the combination-lever G. The extent of this 1 motion depends on thedistance of the block K from the center of the rock-shaft, and thedirection of the motion imparted to the com- ".two components, the firstbeing a constant by any suitable devices.

of the block on'the link the rod I has an elongated slot N, in whichfits a pin O. This pin 0 is carriedby an arm P of the tumbling shaft Q,which is adapted to be manipulated The shaft Q is common vto the twoengines and carries two arms P and p,(-onefor each engine,) the armsbeing at an angular distance of about one hundred and eighty degreesapart. When the to mblingshaft is turned, its cran k-arms move the rodsI 'i with it, whereby the blocks are slid along their respective linksto any desired position thereon. When the tumbling-shaft Q is stationaryin any position, the arms Pp each fit in the slots of the respectiveradiusrods I z' and act as fixed guides for said rods while they arebeing reciprocated by the rockshafts. The pin or block K is thus forcedto move in a substantially straight line, and the movement of thefulcrum H in one direction from the middle position is madesubstantially equal to the movement in the opposite direction. Themotion at the pivot-point H of the combination-lever C-isthus-substantially symmetrical-that is, said pivot-point or fulcrummoves substantially equal distances to each side of its middle position.

From-the foregoing description it is apparcut that the-valve motion isthe resultant of component derived from the reciprocating parts of itsown engine and designed to give the proper iap-and-lead motion of thevalves, and the second component being a variable motion derived fromthe other engine and de-' signed to regulate the throw of the valve, and

thereby vary the point of cut-oflf. Both of.

these components are substantially symmetrical motions and theirresultant gives a substantially symmetrical motion tolthe valve. Themotion of the valve is alternately, swift and slow by reason of itsbeingderived from the cross-heads, as hereinbefore explained.

This alternation of quick and slow valve movement aflords a rapidopening and closof the valve.

n the modification illustrated in Figs. III and IV the parts andconnections which furnish the lap-and-lead motion are the same as abovedescribedthat is, the valve A receives the constant component of itsmotion from the cross-head of its own engine through a rod F, connectingthe'cross-head G to a lever E, which is connected to another rod D,connected to a lever O, which is connected to the valve-rod B. As inFigs. I and II, the lever G-is a floating lever whose fulcrum H at themiddle position ofthe link L coincides with the center of curvature ofthe said link L,

mounted on the rock-shaft m, extendingfrom the other engine. Arod I' ispivotally fastoned to the floating lever and constitutes or carriesthefulcru m H thereof. This rod I also carries a block'K, which fitsandslides a same letters.

on said curved link or in a curved slot therein, and either ,a pin or ablock K or an ex- -on the valve side of the curved link. The other endof said rod S is connected bya link 'I to an arm U of thetumbling-shaftQ. The motion imparted to the block or pin K by the rock-shaft is thusrestricted to a straight line, which makes the movement of the fulcrumsymmetrical. Fig. Vis intended to illustrate the convenience with whichmy invention can be ad-.

justed to various conditions in practice. The

same parts are used as in Figs. I-nnd II in modified forms and aredesignated by the The difference is that-the rods I 2 pass through theholes made therefor in therock-shafts M m. These spaces are provided forby enlarging the shafts at the points V1; and forming holes in suchenlarged parts or by inserting cranks in said shafts. This viewillustrates my gear as applied to parallel cylinders arranged closetogether with their valves between theln.

The modification illustrated in Fig. V1 is designed as a substitute forthe parts which transmit the variable component of the valve iinotionf-rom the rock shaft to the combination-lever. In, this modification therod 1',

. which carries the fulcrum H of the combination-lever at one end,carries an eccentricstrap W at its other end. The form of the slotted,link or block L at the end of the transverse shaft m' is changed to have8 01!- cular'contour over which the eccentric-strap W-fits.. The slottedlink'or blockL is not I fixed on the shaft m, but moves with thecocentric-strap in the direction transverse to the I rod I, and anysiiifable devices may be used for shifting the position of the eccentricstra or link L g The eccentric-rod may be guide by either of the methodshercinbefore described. It is obvious that numerous changes andmodifications may be made in the'mechanical; elements which go to makeup the various connectionsfand actuating device's,'and I do not wish torestrict myself to such details of construction so longas the radius-rodpin in the slotted link or the equivalent of said pin is madeto'reciprocatein a practically straight line. Thus while'the foregoingdescription mentions the reciprocating cross-heads as a source ofmovement, it is obvious that the connections might'be made to otherreciprocating parts or to the shaft.

What I claim is-- y 1. A valve-gear comprising a floating leverconnected to a valve and connected through intermediate connectingdevices to a moving part of the engine, a rod constituting the i 1- crumof -said lever, a curved link operative y connected to said rodand to amoving part 'of the engine for imparting a reciprocating motion to therod, and means for guiding said connecting rod so that its point ofconnection to the link moves in a substantially straight line,substantially as described. I

" I. 2. A valve-gear fora plurality of cylinders comprising a'floatinglever connected to a valve and connected through intermediate devices toa cross-head, a rod constituting the fulcrum of said lever, arockshaftconnected by .suitable connecting devices to another cross-head, acurved link on said rock-shaft, said rod and link being operativelyconnected to said rock-shaft and means for guiding said rod so that atits point of connection to said shaft it moves in a substantiallystraight line, scribed.

3. A valve-gear for a comprising a floating plurality of cylinders leverconnected to a valve and connected through intermediate link and meansfor said guide-pin,

4. A valve-gear for a plurality of cylinders comprising a floatinglever-connected to a valve and connected through intermediate connectingdevices to a cross-head, a rod constituting a fulcrum of said lever, arock-shaft connected by suitableconnectin'g devices to anothercross-head, a curved link operatively connected to said rod and saidrock-shaft for 1 i mparting a reciprocating motion, to said rod,

said rod and straight guides anda tnmbling-shafthaving a crank-armadapted to shift said pin and a guide-pin for tguides simultaneouslywith the shifting of the connection of said curved link, substantiallyas described.

5. A valve-gear for a plurality of cylinders comprising a floating leverconnected to a valve, and connected through intermediate connectingdevices to a cross-head, a rod constituting a fulcrum of said lever, arock-shaftconnected by suitable connecting devices-to anothercross-head, a

vely connected to said rod, and.

curved link on said shaft operati a tumbling-shaft having a crank-armengaging in an elongated slot in said rod, substan-.

- tially as described.

comprising a floating for a pluralil y of cylinders lever connected to athrough intermediate 6. A valve-gear valve and connected shaft connectedby substantially as destituting connecting devices to across he'ad, arod'constituting suitable connecting devices to another cross-head, acurved link op-.

shaft for imparting a reciprocating motion to the fulcrum of said.lever, 'a rock eratively connected to said rod and said rocksaid rod, asecond rod pivoted inthe line ofmiddleposition of said first-mentionedrod and having straight guides adapted to coop erate with the connectionof said first-mentioned rodand shaft with said link, substantially asdescribed." 1 r 7 A valve-gear c'omprisin g afloating lever connected toa valve and .connec'tedthrough intermediate'connecting devices to thereciprocating parts ofan engine, a rocksshaft operatively connected toother reciprocating parts, a curved link on said shaft, a rod conandconnected by a slide .tosaid link, the center of curvature ofthe curveof said link, at

the middle position of said link'coinciding with said fulcrum, said pinin a straight line, substantially as de: scribed. a

.8. Ayalve-gear comprising two reciprocating cross heads,

the fulcrum ofsaid" floating lever and means for guiding 8'5 7 two"rock-shafts having a le-f ver fastened thereto. and connected to thecorresponding cross-head: and said rock-shafts each having a link at itsend, two floating levers each connected to a'sep'arate valve and eachconnected to the c'orrespondingrockshaft lever, two rods eachconstituting the fulcrum of the corresponding-floating lever fittinginli the link .on the and having a pin the opposite cross:

rock-shaft operated, by

head, and a tumbling-shaft having two oppp sitely arranged crank arms,each; of said crank-arms engaging a straight slot in the correspondingrod ,substantially as described. 9. A valve gear for tw parallel-iengines,

comprising two parallel rock-"shafts'opera- 'tively connected todifferent engin'esj'andeach carrying a curved link, each link having a.rod. operatively stituting a fulcrum is connected to the 'gines,.eachfloating lever being connected to a moving part of the engineopposite'ithat to for a floating lever which which the correspondingrock-shaft :i's' connected, saidrock-shafts being formed with; elongatedopenings and each, rod extending through the opening in'the rock-shaftwhich actuates the other rod to a reversing device common to both,-substantially as described.

' L. GARRELS.

I In presence of' JAMES A. CARR, WILLIAM P. CARR.

connected thereto, and 'con-' valve-of one of the en-

